WEB.XML error-page 配置异常页面

<error-page> 
        <error-code>500</error-code> 
        <location>/error.jsp</location> 
 </error-page>

 <error-page> 
        <exception-type>java.lang.NullPointerException</exception-type> 
        <location>/error.jsp</location> 
 </error-page>